用凝胶色谱与毛细管粘度计联用法研究顺丁胶的长链支化

本文讨论了用GPC与自动粘度计联用技术测定高聚物长链支化度的方法,将得到的实测关系η](V)转化成校准关系η](V_R)后,利用在同一淋出体积流出支化物和线型分子的(η]·M)乘积相等这一普遍原理,计算出各级分的支化因子g_i、总平均支化因子以及产生支化的临界分子量M~*,并讨论了检测器与粘度计连结管死体积△V及虹吸管残留液对支化参数计算值的影响。

STUDY ON LONG CHAIN BRANCHING IN POLYBUTADIENES BY GPC COUPLED WITH CAPILARY VISCOMETER

The long chain branching of polybutadienes was measured with a gel permeation chromatog-raph coupled to an automatically recorting capillary viscometer. In this method the experimental relation (η) (V) was transformed to the calibration curve (η) (VR) for the monodis-perse species. The curve is combined with the universal calibration to proviel the molecular weight distribution and an additional parameter, i.e. g, the average branching foctor in this sample. The critical molecular weight at which long chain branching appear changes with polymerization conditions.